(< The cake is a lie.)Yes, In-Game, the prints are Anti-Alasted.
Here are a few prints I put together (Thank you, google images!) for those who are building portal recreations. Not all of them are here that are seen in the actual Portal game, but I will add them soon.
Yes, I know, the "Stickfigures" Should be blockheads, but I'm not that great of an artist.